You don't. Thats the broodies job. Why do chicken keepers/breeders who use broodies, the only way to hatch chicks by the way, feel the need to get involved at every stage. My run is 20 X 30 ft. Yes I know larger than most. In the run I currently have 4 layers, 5 growers/15 wks, which were raised my broody Sussex. who liked being broody so much she layed a couple of eggs then went broody again, she has just hatched 7 chicks. Inside the run i have a seperate broody box and small run to keep her safe and undisturbed. The chicks are in the broody run for a week, then, are free to join the layers & growers under the broodys protection. I don't have any bullying or pecking issues, peace & tranquillity really, and when the growers finally confirm thier gender the noisey ones will make a nice sunday dinner for two. Is it essential that you must feed them growers/layers pellets with a treat of kitchen scraps on a day with a "s" in it? Mine are feed the three G's...Grain..Grass..Grit and occasional cooked scraps/oats. A lot less smelly in the hen house by the way. Vets should never see a chicken unless it is a champion of the breeding/showing ring. Buy another six POL's with the money. Don't let chicks suffer, cull if no improvement in health. Finally I know this seems to be a bit of a rant, but I feel that nature knows best, so why look to change it. So let your chicks intergrate with the adults within days of hatch and you will end up with hardy, disease resistant & run wise layers.